A Six Sigma certification is one of the more reliable ways to raise your salary in operations, quality, manufacturing, or project management — but the word “certification” hides a lot of variation. A $15 Udemy certificate and an ASQ Black Belt are both called “Six Sigma certifications,” and they are not remotely the same thing to an employer.
This guide sorts it out. We cover the belt levels, the courses worth taking at each one, and — just as important — the accrediting bodies (ASQ, IASSC, CSSC) that decide whether your certificate actually carries weight. Every course below has been checked for its current rating and last-updated date.
Last updated: June 2026. Written by Josh Hutcheson, OnlineCourseing editor. We verify every course is live and read its current ratings before recommending it. See our wider professional-skills guides.
QUICK VERDICT
Bottom line: For a university-backed credential, start with the Coursera Six Sigma Yellow Belt Specialization from Kennesaw State. For an affordable, accredited belt you can finish fast, the Udemy “Certified Lean Six Sigma” series (White → Green → Black) is the best value. If you want a credential a hiring manager instantly respects, sit the ASQ exam — the gold standard.
- Best university credential: Coursera Six Sigma Yellow Belt (Kennesaw State)
- Best value, accredited: Udemy Lean Six Sigma Green Belt (4.6, 28,000+ ratings)
- Most respected: ASQ Certified Six Sigma Green/Black Belt (exam-based)
- Typical cost: Udemy ~$13–$25 on sale; Coursera ~$49/month; ASQ exam ~$338–$538
- Skip if: your employer specifies a particular body — take theirs
View the Yellow Belt Specialization →
The best Six Sigma certifications at a glance
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| Certification / Course | Provider | Rating | Best for |
|---|---|---|---|
| Six Sigma Yellow Belt Specialization | Coursera (Kennesaw State) | 4.7 (4,323) | A university credential |
| Six Sigma Green Belt Specialization | Coursera (Kennesaw State) | 4.7 (4,810) | The university next step |
| Certified Lean Six Sigma White Belt | Udemy (Accredited) | 4.7 (16,165) | A cheap first step |
| Certified Lean Six Sigma Green Belt | Udemy (Accredited) | 4.6 (28,787) | Best value overall |
| Certified Lean Six Sigma Black Belt | Udemy (Accredited) | 4.6 (11,049) | Advanced practitioners |
| ASQ Certified Six Sigma Green/Black Belt | ASQ (exam) | — | Maximum recognition |
Six Sigma belts, explained
Six Sigma uses a martial-arts belt system to mark how deep your training goes. Knowing where you sit saves you from buying the wrong course:
- White Belt — a few hours; the vocabulary and core ideas. A fast, low-cost way to test the water.
- Yellow Belt — supports improvement projects as a team member; understands DMAIC at a working level.
- Green Belt — leads smaller projects and analyzes data; the level most employers actually ask for.
- Black Belt — leads complex projects full-time and mentors Green Belts; deep statistics.
- Master Black Belt — trains Black Belts and runs the program at an organizational level.
For most people the sweet spot is Green Belt — it is the level that appears in job descriptions and pay bumps. Start with White or Yellow if you are new, and only go Black Belt once Six Sigma is central to your role.
How we chose these certifications
We weighed three things: the credibility of the certificate (who stands behind it), the quality of the training (rating volume, freshness, instructor track record), and value for money. We deliberately separated the training from the credential, because in Six Sigma they are often not the same provider — you can train anywhere and sit an ASQ exam separately. Every paid course below was last updated within roughly a year and carries thousands of recent ratings.
1. Coursera Six Sigma Yellow Belt Specialization — best university credential
Offered by Kennesaw State University through Coursera, this four-course specialization is the best blend of recognition and price. It teaches the Define-Measure-Analyze-Improve-Control (DMAIC) framework from the ground up and ends with a certificate that carries a real university name. It holds a 4.7 rating from 4,323 reviews with an enormous 238,862 learners enrolled — the most popular Six Sigma program on Coursera.
It is beginner-friendly and self-paced; most learners finish in two to four months at Coursera’s ~$49/month, so your total cost depends on your speed. Choose it if you want a credential backed by an accredited university rather than a course platform’s own certificate.
Enroll on Coursera (free trial) →
2. Coursera Six Sigma Green Belt Specialization — the university next step
When you are ready to lead projects rather than support them, Kennesaw State’s Green Belt specialization is the natural progression. It goes deeper into statistical analysis, hypothesis testing, and managing improvement projects end to end. It earns a 4.7 rating from 4,810 reviews with 98,217 enrolled.
Because Green Belt is the level most employers ask for, this is the credential to target if you want the qualification to show up on your resume and in salary negotiations. Same ~$49/month Coursera pricing; budget three to five months for the full series.
View the Green Belt Specialization →
3. Udemy Certified Lean Six Sigma White Belt — best cheap first step
If you just want to find out whether Six Sigma is for you, start here. This accredited White Belt course covers the fundamentals and DMAIC basics in a couple of hours and includes a certificate of completion. It holds a 4.7 rating from 16,165 ratings and was updated in October 2025, making it the freshest entry point on this list.
At Udemy’s usual sale price, it is a low-risk way to learn the language before committing to a longer Green Belt program. It is part of the same accredited series as the Green and Black Belt courses below, so the progression is seamless.
4. Udemy Certified Lean Six Sigma Green Belt — best value overall
This is the course we recommend to most people. It delivers a full Green Belt curriculum — DMAIC, statistics, and the Excel applications you will actually use — with accreditation behind the certificate. With a 4.6 rating from 28,787 ratings (the highest review count of any Six Sigma course here) and a January 2026 update, it is both proven and current.
For a fraction of what a classroom Green Belt costs, you get a thorough, current course you can finish at your own pace. The trade-off versus ASQ is recognition: this is excellent training and a legitimate accredited certificate, but the most prestigious employers may still ask specifically for ASQ (more on that below).
5. Udemy Certified Lean Six Sigma Black Belt — for advanced practitioners
Once Green Belt is behind you and you are leading larger projects, the Black Belt course in the same accredited series picks up the advanced statistics, design of experiments, and project leadership that the role demands. It holds a 4.6 rating from 11,049 ratings and was also updated in January 2026.
Most people should not start here — Black Belt assumes Green Belt knowledge. But if Six Sigma is becoming a full-time part of your role, it is a cost-effective way to get the advanced material before, if needed, sitting a formal Black Belt exam.
The accrediting bodies that actually matter: ASQ vs IASSC vs CSSC
There is no single global authority for Six Sigma, which is exactly why the certificate landscape is confusing. Three bodies carry the most weight:
- ASQ (American Society for Quality) — the most respected name, especially in the United States. Its Certified Six Sigma Green Belt (CSSGB) and Black Belt (CSSBB) are exam-based, require documented project experience for the Black Belt, and are the credentials most likely to be named in a senior job posting.
- IASSC (International Association for Six Sigma Certification) — a widely recognized, vendor-neutral body. IASSC certifies via exam only (it does not deliver training), which is why many course providers advertise that their material is “aligned to the IASSC Body of Knowledge.”
- CSSC (Council for Six Sigma Certification) — an accreditation body that backs many online courses, including a number of affordable Udemy programs. Respectable and budget-friendly, though generally seen as a notch below ASQ in prestige.
The practical takeaway: a course can teach you brilliantly while the certificate behind it varies in prestige. If your target employer names a body, follow it. If not, ASQ is the safest premium choice and a CSSC-accredited online course is the best value.
Are Udemy “accredited” Six Sigma certificates legit?
Mostly, yes — with a caveat worth understanding. The accredited Udemy belt courses above are genuinely accredited (typically through CSSC or an aligned body), and the certificate you receive is real. What they are not is the ASQ exam. So they are excellent for learning the material and for roles that accept any recognized Six Sigma certificate, but they will not substitute when a posting specifically demands “ASQ CSSGB.”
A smart, economical path many people take: learn with an affordable accredited course, then sit a formal ASQ or IASSC exam separately if and when a job requires it. You get strong training at low cost and the premium credential only when you actually need it.
How much does a Six Sigma certification cost?
Costs vary widely by route. Udemy accredited belt courses typically run about $13–$25 during regular sales. Coursera specializations are billed at roughly $49/month, so a two-to-four-month pace lands around $100–$200. The premium route is the ASQ exam, which costs roughly $338–$538 depending on belt and membership status, on top of whatever training you used to prepare. Classroom Black Belt programs from training firms can run into the thousands — rarely necessary for individuals.
Which Six Sigma certification should you get?
Match the route to your situation. New to Six Sigma? Take the Udemy White Belt or the Coursera Yellow Belt to learn the language cheaply. Want the credential most employers ask for? Target Green Belt — Coursera’s Kennesaw State specialization for a university name, or the accredited Udemy Green Belt for value. Aiming for senior quality or operations roles? Train with any solid course, then sit the ASQ Black Belt exam. Employer named a specific body? Follow it exactly — that is the one that counts for you.
See the top Green Belt course →
Is a Six Sigma certification worth it?
For roles in operations, manufacturing, supply chain, healthcare quality, and project management, it is one of the better-value credentials you can hold — Green and Black Belts are routinely listed as preferred or required, and certified professionals commonly command a salary premium over uncertified peers. It is less relevant in fields with no process-improvement function. As with any certification, the qualification opens doors; applying the methodology to real projects is what advances your career.
What Six Sigma certification does for your salary and career
The reason Six Sigma certifications hold their value is that they map to measurable business outcomes — fewer defects, lower costs, faster cycle times — that companies will pay for. In practice, salary surveys consistently report that certified Green and Black Belts earn more than uncertified peers in the same roles, with the premium widening at Black Belt and Master Black Belt levels, where the work shifts toward leading multiple high-value projects. ASQ’s own salary survey is a useful, credible reference point if you want current figures for your industry and region.
The roles where it pays off most are process-heavy: operations and continuous-improvement managers, quality engineers, supply-chain and logistics analysts, healthcare quality specialists, and project managers in manufacturing or services. In all of them, a Green Belt signals you can scope a problem, measure it, and deliver a quantified improvement — exactly the skill set those teams are hired to provide. The certificate gets you shortlisted; a portfolio of completed improvement projects, with hard numbers attached, is what gets you promoted.
How to prepare for and pass the certification exam
If your goal is a formal ASQ or IASSC exam rather than a course certificate, treat the course as preparation and the exam as a separate milestone. A few things make the difference: work through the full DMAIC cycle until you can apply each tool from memory, not just recognize it; practice the statistics by hand and in Excel or Minitab, because the exams test application, not recall; and use a current body-of-knowledge outline to find your weak spots before exam day.
For the ASQ Black Belt in particular, check the requirements early — it asks for documented completed projects (or signed affidavits) alongside the exam, so plan that evidence well in advance. Many candidates pair an affordable accredited course for the teaching with a dedicated exam-prep question bank for the final weeks, which is a cost-effective way to walk in confident.
Frequently asked questions
Which Six Sigma certification is most recognized?
ASQ (American Society for Quality) is the most respected certifying body, particularly in the United States. Its Certified Six Sigma Green Belt and Black Belt are exam-based and the credentials most often named in senior job postings. IASSC is also widely recognized and vendor-neutral.
Can you get Six Sigma certified online?
Yes. You can complete every level entirely online — the Coursera Kennesaw State specializations and the accredited Udemy belt courses are all online and self-paced. The ASQ and IASSC exams are also available through online proctoring.
Which belt should I start with?
If you are new, start with White or Yellow Belt to learn the fundamentals cheaply. Green Belt is the level most employers ask for, so it is the most common target. Only pursue Black Belt once you have Green Belt knowledge and Six Sigma is central to your role.
How long does it take to get Six Sigma certified?
A White or Yellow Belt can take a few hours to a couple of weeks. A Green Belt typically takes one to three months of part-time study; a Black Belt longer, plus documented project experience for some exams like ASQ’s.
Is a Udemy Six Sigma certificate accredited?
The accredited Udemy belt courses are genuinely accredited, often through the Council for Six Sigma Certification (CSSC) or an aligned body, and the certificate is real. They are not the ASQ exam, though, so they will not substitute when a posting specifically requires ASQ certification.
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